Does what it say's, easy to use..an inexpensive option for the purpose.

Quick delivery,had tried laser collimator which was not collimated itself you are far better with the cap I was able to collimate my telescope in no time at all and I'm just a beginner

Simple, cheap and highly accurate.

A great little addition to your collimation toolkit. Just place it in your focuser and check your mirror alignments visually. A good fit in my 1.25” adapter. Sent out and received in 24 hours. Great service

All you need for collimating a Newtonian. Better than using a laser device, some of which are not collimated properly themselves in which case they will never do the job unless you can re-collimate them.

The instructions provided won't be adequate if you are inexperienced, though better instructions are available online, in some books and on u-tube so it shouldn't be a problem.

The cheapest way to accurately collimation your telescope, though it was expecting it to be made from metal rather than plastic. Non the less, it works well and should be all you'll need.

I've used First Light Optics before-always get prompt efficient service, products always described accurately and packaged safely. Highly recommended.

Very easy to use, makes misalignment obvious instantly. I find it much simpler to use than any Cheshire or combination eyepiece with crosshairs.
If the primary mirror is centre marked then it's a doddle. I'd note that the hole on the cap is slightly off centre yet no matter how I turn it in the focuser the 'off centre' reflection stays within the centre mark of the primary mirror so it works fine for me.

Should have had one of these in my astro toolkit years ago. Cheap, effective and highly accurate. Easy to use with full instructions. At last, something to rely on that can be completed within less than a minute. The results from my F5 speak for themselves. Great bit of kit FLO, delivered on time with the usual gold standard of service.

Cheap, easy to use and very effective. My new scope needed a slight adjustment which only took a couple of minutes with this collimation cap. Highly recommended.

Simplicity itself. Having tried the laser tool that turned out to be useless as couldn't collimate that tool ad incoherent light I tried the Cheshire tool. Having looked at a useful YouTube item on collimation discovered the Collimation cap. After receiving this tool I was able to accurately collimate my reflecting telescope in minutes. So much value in a modestly priced tool.